| The ship will be polluted by marine life during service.The silicone coating was modified by silicone oil,which made the coating surface have the characteristics of oil secretion on the skin of marine animals like dolphins and sharks,which can enhance the anti fouling performance of the coating and reduce the marine biological pollution.Therefore,based on previous research experience,it is important to study the compatibility of silicone oil and silicone resin and its migration mechanism and precipitation behavior by changing temperature,humidity,type of silicone oil and the amount of silicone oil added,which is of great significance to realize the long-term and controllable precipitation of silicone oil in silicone coating.Through theoretical research and experiment,it is found that the higher the temperature is,the faster the surface and solid drying speed of the coating is;The higher the humidity is,the faster the drying speed is;The curing temperature has little effect on the mechanical properties and surface properties of the coating;Adding three kinds of silicone oil can decrease the mechanical properties of the coating,methyl silicone oil and phenyl silicone oil can decrease the water contact angle and Diiodomethane contact angle of the coating,and methyl fluorosilicone oil can slightly increase the water contact angle and Diiodomethane contact angle of the coating.The compatibility of the blend solution of PDMS and silicone oil conforms to the F-H lattice model;Thermodynamic analysis and swelling experiments show that the swelling ability of silicone oil for silicone coating is inversely proportional to the interaction parameters of silicone oil and PDMS in F-H lattice model;During the observation period,the silicone oil dispersed in the silicone coating in the form of swelling did not precipitate on the surface of the silicone coating;By observing the fracture morphology of the silicone oil / silicone coating,it is found that the morphology of the silicone oil at the fracture is consistent with that of the silicone oil in the blend solution,that is,the phase separated droplets in the blend solution can be retained in the coating as droplets;The results show that the silicone oil precipitates only on the surface of phenyl silicone oil / silicone coating.When the concentration of phenyl silicone oil is higher than that of phase separation,the silicone oil precipitates quickly on the surface of the coating;The silicone oil migrates along the gap between the coatings inside the silicone coating.After curing at a higher curing temperature,the silicone oil is allowed to stand at room temperature.The volume of the silicone coating shrinks when the temperature decreases,and the gap inside the coating becomes larger,which is conducive to the precipitation of silicone oil.The addition of powder can obviously enhance the mechanical properties of phenyl silicone oil / silicone coating,but has different effects on the precipitation mechanism of silicone oil.Through the immersion test and the quantitative measurement of phenyl silicone oil concentration in the immersion solution by UV spectrophotometer,it is found that the amount of silicone oil dissolved in the carbon nanotube reinforced silicone coating is the largest in the same time;Through the observation of the coating fracture and surface,it is found that silicone oil droplets can be observed on the fracture surface of glass fiber and carbon fiber reinforced silicone coating,and a large amount of silicone oil is also precipitated on the surface.The results show that the silicone oil precipitates quickly on the surface of the fiber-reinforced silicone coating with free phenyl silicone oil droplets inside. |
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